Questions tagged [counter]

A digital circuit that literally "counts" - it progresses through a sequence of states that are representative of some value. It need not count in a natural progression i.e. 1,2,3,4,5 etc. to be considered a counter (i.e. you can have different count sequences) each count value need not be of significance to other circuits (i.e. sometime it's sufficient that the counter counts to some value and then stops). Examples are Gray code, up/down counter.

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Counter with 4 flip flops jk synchronous from 3 to 13 [duplicate]

I have to create a counter with 4 flip flops jk synchronous. The counter shall count in this order: 3 to 13 and then to 3 to 13 and so on.. I have to use logisim simulator. Until now what i´ve ...
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137 views

Is this circuit a viable implementation? [duplicate]

Following on from an earlier question where the implementation was flawed, can anyone advise if the below is a viable implementation of a circuit to handle a matrix keypad? The idea is that one ...
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146 views

Resettable counter using JK flip

I want to design a binary counter in Cadence that counts pulses in every consecutive 50 nano seconds but i want it to be reset at the end of each 50 ns and shortly - so that it doesn't miss any pulse -...
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Prime numbers direct counter [closed]

How can I design a prime numbers counter up to 63?I need to find a rule for the bits? I know how to usually design counters but this one seems kind of difficult since there are so many numbers
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104 views

Need help building a basic LED voltmeter [closed]

I have to make a LED voltmeter using basic logic gate circuits like flip flops, counters, encoders etc and show the input voltage using 7 segment displays. How do I count the input voltage. Will using ...
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Serial Counter in digital electronics [closed]

What exactly is a serial counter in digital electronics? Someone told me it is a way of to design a counter with shift registers and some combinational circuit to obtain s counter that operates ...
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643 views

Frustrated With D flip flop assignment

We are doing a project at school with AOI, NAND and NOR logic. The logic is used sequentially to display a number on an LED display, more specifically it is suppose to display the numbers of your ...
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Why does my counter doesnt do my desired sequence? [closed]

Hey there guys i have to built up a counter with the following sequence : 1-2-5-6-7-8-11-12-15, my Multisim schematics works like a charm, but when i'm about to build it on my breadboard it doesn't ...
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468 views

How can I see the current state and next state signal? [closed]

I was looking at this code: http://vhdlguru.blogspot.co.uk/2010/04/how-to-implement-state-machines-in-vhdl.html and I wanted to know how you would run the simulation in vivado, but then apart from ...
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Design using only D FF a counter that goes 0->2->1->5->7 [closed]

Have this as an exercise in my logic design textbook. I know how to do this with additional logic, but the challenge comes from only having D flip-flops available. I assume there are at least 3 of ...
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996 views

VHDL Knight Rider

I am newbie in VHDL. In my code, everything seems right but code doesn't work properly. I couldn't find where my fault is. Any solutions? ...
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Count external clock pulses for a predefined time interval (PIC16f877a)

I need to count external clock pulses for a predefined time using PIC16f877a. I don't know what to use, whether counter or timer or both. I don't know to use timer and counter modules of PIC16f877a. ...
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The meaning of T0CLK=1 [closed]

i know that there are two types for clock in a Timer in a micocontroller one of them is the counter and i wonder how the counter can be a clock ?
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Can someone tell me whats wrong on this 4 bit counting circuit? [closed]

The circuits are a 555 timer and a 74161 counter, its supposed to do a simple 4 bit count up, however when I give it 5V it just keeps the first LED permanently on without changing And the schematic
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Learn CPLD from zero [closed]

a) Should I learn VHDL or Verilog? Is one excel in some area while the other better fit another area? For simple "glue logic", says, 5 to 30 TTL chips equivalant, which is better? b) First ...
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modifying a frequency counter to make it a frequency meter [closed]

Is it possible to modify this circuit and make it a frequency meter? This is an assignment and none of us know how to do that. We all have considered to make another circuit and not modify the one ...
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Designing a special counter using logic gates

I need to design a counter circuit that counts in 5-bit binary form between the numbers (0-31) by 5 using only logic gates without any programming. when the counter reaches 30 it must go as 3..8..13.. ...
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366 views

AVR 60Hz periodic interrupt [closed]

How can I configure an AVR microcontroller timer to generate periodic interrupt events at 60 Hz rate, using 14.745 MHz system clock?
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How to represent a 3 bit counter in Data flow style? [closed]

I want to represent a 3 bit counter in Data Flow style in VHDL. But I am getting confused. Any hints how it is going to be represented.
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How do I build a 4-bit synchronous direct counter using only D Flip-Flops? [closed]

I have to build a counter using only D Flip-Flops and wires. What's the approach?
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1answer
435 views

Synchronous decade counter only 3 AND gates

I need a design for a synchronous decade counter that can have no more than 3 gates, excluding the JK's. I do not need to design this myself as it is considered above the level of course I am doing, I ...
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1answer
115 views

frequency counter [closed]

I am an amateur in electronics and am going to make an RF frequency counter. So after searching, I selected this circuit but my input signal is RF while the input of the circuit is a pulse. For ...
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5answers
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Counter with 4 flip flops jk synchronous from 3 to 13!

I have to create a counter with 4 flip flops jk synchronous. The counter shall count in this order: 3 to 13 and then to 3 to 13 and so on.. I have to use logisim simulator. Ok. So i think its ...
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votes
1answer
110 views

Large timer interrupt instructions [closed]

Assume that it takes the micro-controller 1 microsecond to execute an instruction and the timer overflow has also been set to 1 microsecond and in the timer interrupt handler we have some instructions ...
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Is it possible to attach PNP counter to an NPN encoder? [closed]

As a follow-up of my previous too generic question I have a signal generator (shaft encoder) that has 2 NPN outputs. I have a high speed counter that needs PNP signals. How can I convert the encoder ...